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A209107
as a simple table
n
a(n)
1
1
2
3
3
11
4
120
5
1683
6
32802
7
802125
8
23766209
9
827695021
10
33165786247
[1,3,11,120,1683,32802,802125,23766209,827695021, 33165786247]